I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
capita caput coapt capote caped coopt cupid kaput capped copied copout cowpat kaputt
capita pita pit sopite uppity septa sputa spite spit spait pipit sapota nepeta lepta pity pitta pieta tapeta wapiti